Shell Programming and Scripting

OK, here's try #2:

Code:

#! /bin/bash

for file in /logs/logfile.*; do
	while read ip; do
		if [[ "${file#${file%??}}" == ".Z" ]]; then
			# This is a compressed file - it ends with .Z - use zgrep
			zgrep ${ip} ${file} >> ~/results/output_log_${ip}
		else
			# Not a .Z file - regular ol' grep
			grep ${ip} ${file} >> ~/results/output_log_${ip}
		fi
	done <iplist
done

In your example, you're redefining the "logfile" variable - only the last one will count. You could set an array or a simple list of files to loop through, though.

See mine above - it gathers the list of logfiles at run time and loops over each one, checks to see if it has a .Z (I assume you use that to mean compressed - it's typical but not necessarily true) to determine if it should run grep or zgrep, appends the output to the output_log_$ip file (append will create if necessary).

I haven't really tested it - does it work on your system with your data?